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This conditional tag checks if a single post of any post type except attachment and page post types is being displayed. If the $post parameter is specified, the function will additionally check if the query is for one of the posts specified. To check for all the post types, use the is_singular() function.
<?php is_single($post); ?>
is_single(); // When any single Post page is being displayed. is_single('17'); // When Post 17 (ID) is being displayed. is_single(17); // When Post 17 (ID) is being displayed. Integer parameter also works
is_single('Irish Stew'); // When the Post with post_title of "Irish Stew" is being displayed. is_single('beef-stew'); // When the Post with post_name (slug) of "beef-stew" is being displayed. is_single(array(17,'beef-stew','Irish Stew')); // Returns true when the single post being displayed is either post ID 17, or the post_name is "beef-stew", or the post_title is "Irish Stew". Note: the array ability was added at Version 2.5.
is_single() is located in